Cameo

Animaniacs

Animaniacs
Sega Megadrive
© Konami 1994 -- ¥?

There is a brief appearance of the Vic Viper (and an Evil Vic Viper) in Konami's Animaniacs for the Sega Megadrive.

If you put in the password shown in the left image then select Studio 2 you will see the filming of the Gradius Movie.

The SNES version of Animaniacs is a completely different game different so I cannot say if Vic Viper is in that version.