Heres the Ideas for Season 6 and 7 from PhantomT1tan:
1) Return part 1- Slade is back and looking for revenge on the girl that killed him. He first must make sure that the Titans are busy and unable to save her.
2) Return part 2- Slade sends his robots to siege Titans Tower. Meanwhile Slade sends an unfrozen Plasmus/Cinderblock/Overload combo to capture Terra.
3) Return part 3- The last of the robots manage to break into Titans Tower only to have Cyborg blast them with his Titan Cannon(same from "The End 1"). After hacking into one of the robots cyborg discovers that Slade has captured Terra and Beast Boy runs off to find her.
4) Return part 4- Beast Boy has gone off to look for Terra but Slade has other plans for him. Slade begins to torture Terra and suddenly her memory comes flooding back and she is trapped in a special device that renders her powers useless. The other Titans find Slade and the final battle over Terra begins.
5) Memories- With her memory back Terra tells how she became human again and why she decided to forget everything that happened.
6) Double Date- Robin finally gets the courage to ask Starfire on a Date and is joined by Kid Flash and Jinx.
7) Soft Spoken- With his last defeat still fresh Slade looks for a new apprentice-Jerhico.
Time Difference- With the help of Raven, Cyborg has created a time machine so that he could go back in time and convice Sarasim to join the Titans.
9) Titans North- With the help from the Titans and Titans East, Titans North is created featuring Kole, Gnarrk, Red Star, Herald and Kilowatt. Their first mission is to help locate missing a missing Titan- Jerhico
10) Thoughts of Change- Robin has been thinking of a new identity and remembers Starfires trip through time. As he ponders this he decides to leave while he thinks.
11) Double Date Part 2- Beast Boy can't decide who he want to take to the rock concert- Raven or Terra.
12) Infiltration- Titans North has not been in contact for months.
13) Titans South- Pantha, Argent, Hotspot, Sarasim and Wildebeast look for Titans North only to find the North T destroyed.
14) History Lesson- Warp has returned and is looking to get even with Starfire. But Starfire has a friend of the Night.
15) In the Fast Lane- Kid Flash and Mas y Menos decide to race around the world to see who is faster. But the Hive Five, who have been thawed by time, have other plans for the fastest teens in the world.
16) Like Father, Like Son- Slade has planned a new assault on the the Teen Titans with help from his new apprentice- Jerihco
17) The Final Battle Part 1- Jerihico with a new costume controls Titans North, South and hundreds of Slade bots to invade and destroy the Teen Titan's.
1 The Final Battle Part 2- While Jerhico begins his attack, Slade sends out the element creature for a bigger surprise.
19) First Words- The Titans are being slowly overrun as they fight the element creature, Slade bots and Titans North and South. But a mysterious voice keeps saying "Forgive Me".
20) Counter attack Part 1- Terra has defeated the element creature and begins to fall ill while the other Teen Titans trap the other team members and call for back up.
21) Counter attack Part 2- Titans East shows up in time to defeat the last of the Slade bots. Meanwhile Slade takes Jerihco back to his hideout.
22) Discovered- All Titans begin a sweep of the city to look for Slade.
23) Forgiven- The Titans have located Slade and Jerihco. Beast Boy is called back to Titans Tower by Terra.
24) Victory- The Titans have finally defeated Slade and remove his mask for the real face of Slade.