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The BL Lacertae (BL Lac) object OJ 287 is one of the most dynamic blazarsacross the directly accessible observational windows: spectral, timing,polarization, and imaging. Apart from behaviors considered characteristics ofblazars, it exhibits peculiar timing features like quasi-periodicity in opticalflux as well as radio-detected knots position and has shown diverse transientspectral features like a new broadband continuum dominated activity phase,Seyfert-like soft-X-ray excess, highly transient iron line absorption feature,a thermal-like continuum-dominated optical phase, large optical polarizationswings associated with one of the timing features, etc. that are rare inblazars and contrary to currently prevailing view of BL Lacs. Theoreticalconsiderations, supported by existing observations invoke scenarios involving adynamical interplay of accretion and/or strong-gravity-induced events (tidalforces) in a binary supermassive black hole (SMBH) scenario to impact-inducedjet and only jet activities. Many of these scenarios have some definite andquite distinctive observationally testable predictions/claims. Theseconsiderations make OJ 287 the only BL Lac to have an activity phase withdominance related to accretion and/or accretion-perturbation-induced jetactivities. We present a brief overview of the unique spectral features anddiscuss the potential of these features in exploring not only relativistic jetphysics but issues pertaining to accretion and accretion-regulated jetactivities, i.e. the whole spectrum of issues related to the jet-accretionparadigm.

The BL Lac Object OJ 287: Exploring a Complete Spectrum of Issues Concerning Relativistic Jets and Accretion