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The Avenger was a variant of the Challenger with an open turret to help reduce weight, but it never got past the prototype stage.
The Challenger was not a complete waste though, as lessons learned from it aided in the design of the Comet.
An exemplar still survives at the Overloon War Museum in The Netherlands.
| British armored fighting vehicles of World War II |
| Cruiser Tanks |
| Mk I | Mk II | Mk III | Mk IV | Mk V Covenanter | Mk VI Crusader | Mk VII Cavalier | Mk VIII Centaur | Mk VIII Cromwell | Challenger | Comet |
| Infantry Tanks |
| Mk I Matilda | Mk II Matilda | Mk III Valentine | Mk IV Churchill |
| Self-propelled artillery |
| Bishop | Sexton |
| Tank destroyers |
| Archer |
| Experimental vehicles |
| Avenger | Black Prince | Tortoise | Valiant |
| British armored fighting vehicle production during World War II |