Need help identifying the weapons and accessories in the picture. Thank you!!

#4 and #9 are TYCO Battletech
#8 is Kenner M.A.S.K.

Thank you so much!

#12 and #20 are Mattel Food Fighters.

#13 is from Jurassic Park Alan Grant 1993 figure i think

Food Fighters! Wow, thank you! Just watched the commercial and I totally remember them now.

Yup, 13 is Alan Grant! Thank you!!

2. GI JOE Cobra Stun engine covers.
6. GI JOE Zandar weapon but not sure when it was released in that color. Street Fighter movie?
7. MIght be Exo-Squad Phaeton e-frame missile
8. GI JOE Cobra Toxo Viper helmet
14. Remco American Defense or US Forces
16. GI JOE Darklon's Evader gun
18. GI JOE PAC RAT Missile launcher controller
19 GI JOE Mercer V2 pack

Wow, that's incredible. Thank you, Sean!! The Zandar gun I knew, but like you I'm not sure when it was released in silver (not even in a battle pack) so I think it might be a knock off.

20 is a Steel Brigade version of the Duke (1984) pack
21 looks like, but isn't, a GI Joe pack -- probably it's Lanard/Corps, but not sure. any markings?

Nope. 20 is a food fighters backpack and i already identified it.

I think 1 is 1 power rangers megazord dinozord.