The Batman Season 4 Episode 7

This is the only episode in season four that Robin does not appear in.

When looking at the uniforms, they mention they state that the smaller uniform is of the Red Robin. While never using this name in any animated series, Dick does take this name in the Limited Series Kingdom Come. The name Red Robin was later used by Jason Todd, the second Robin, during Countdown to Final Crisis.

Running Gag: The commanding investigator calling Victor Fries "Dr. Frost", but being corrected to "Mr. Freeze".

During the fight with Mr. Freeze, Oracle mentions "alerting Chief Bennett." This may mean that after being cured of the Clayface mutation, Ethan Bennett has rejoined the force and has risen to the rank of Police Chief.

Commissioner Gordon and Alfred make brief appearances in this episode, but only as old men and not in their present versions.

UK airdate: 23rd January, 2007.

The police investigators mistakingly think that Thomas and Martha Wayne (Bruce's parents) were Batman and Batwoman (which is what Barbara tried to call herself before accepting the title "Batgirl") and thought that Bruce himself was Robin. However, they aren't far from wrong: in some of the earliest stories (likely retconned out of existance) Thomas Wayne did wear a bat costume to a party shortly before he and his wife were fatally shot by a hired goon, and young Bruce briefly wore a red-and-green costume and fought crime under the name "Robin".
They also assume that an old wheelchair belonged to Alfred in his later years; in reality, it was Barbara's (though the nature of her infirmity is never explained).

The present day Batman, Batgirl and Robin are not shown in the episode. Only an older Batman, Oracle and Nightwing are shown

The entire episode is set in the future, switching from the year 2027 to the year 3027.

This marks the Oracle's first appearance on any DC animated series. Though, older Barbara Gordon did have a recurring spot on Batman Beyond, her life as the Oracle was never spoken of (implying it never happened).

Mr. Freeze appears in the future in a new suit.