The purpose of the study in Part 1 (dose escalation) and in Part 2 (dose expansion) is to determine the recommended Phase 2 dose(s) (RP2D\[s\]) and evaluate preliminary clinical efficacy. Part 3 (dose expansion) will confirm safety and preliminary clinical activity at the RP2D. Part 4 (RP2D expansion; MoonRISe-2) will assess the overall complete response (CR) in participants with intermediate-risk-non-muscle invasive bladder cancer (IR-NMIBC; means the cancer cells are only in the bladder's inner lining).