New Teen Titans (1984) #91

Total Chaos: Part 5 of 9. “Growing Pains!” Guest-starring Phantasm and the Team Titans. Written by Marv Wolfman. Art and cover by Tom Grummett and Al Vey. Story continued from Deathstroke the Terminator (1991-1996) #15. The Titans are reeling from their battle with Lord Chaos. But when Team Titans surprisingly get rowdy, baby Wildebeest reveals a surprise of his own. Plus, the startling return of Phantasm.

Note: reference picture, not an actual scan